<%@ page  contentType="text/html;charset=UTF-8" language="java"%>
<html>
   <head>
       <title>登陆</title>
       <style>
         .error{color:red}
       </style>
   </head>
   <body>
       <div class="error">${error}</div>
       <form action="${pageContext.request.contextPath}/login" method="post">
                          用户名:<input type="text" name="username"/><br/>
                          密码:<input type="password" name="password"><br/>
         <input type="submit" value="登陆"/>
       </form>
   </body>
</html>